<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    *{
        padding: 0;
        margin: 0;
    }
    .chat_commento{
        width: 450px;
        height: 650px;
        margin: auto;
        border-radius: 10px;
        border: 2px solid #f4f5f7;
    }
    .clearfix::after{
        content: "";
        display: block;
        clear: both;
        width: 0;
        height: 0;
        line-height: 0;
        visibility: hidden;
    }
    /* top */
    .chat_top{
        width: 100%;
        height: 50px;
        border-top-left-radius: 10px;
        border-top-right-radius: 10px;
        padding-left: 20px;
        font-size: 20px;
        line-height: 50px;
        box-sizing: border-box;
        font-weight: 550;
        border-width: 0px;
    }
    /* middle */
    /* 左边 */
    .chat_middle{
        width: 450px;
        height: 455px;
        position: relative;
        box-sizing: border-box;
        overflow: auto;
        border-width: 0px;
    }
    .chat_left{
        width: 100%;
        height: 120px;
        margin-top: 20px;
    }
    .chat_left_item_1{
        width: 50px;
        height: 50px;
        background-color: #4459AB;
        float: left;
        margin-top: 10px;
        margin-left: 10px;
        margin-right: 10px;
        text-align: center;
        line-height: 50px;
        color: white;
        border-radius: 25px;
    }
    .chat_left_item_2{
        width: 55%;
        height: 100px;
        float: left;
        margin-top: 10px;
    }
    .chat_left_item_2 .chat_left_chat{
        float: left;
    }
    .chat_left_item_2 .chat_left_content{
        padding: 15px;
        margin-top: 10px;
        background-color: #f4f5f7;
        display: inline-block;
        border-radius: 10px;
        border-top-left-radius: 0px;
    }
    /* 右边 */
    .chat_right{
        width: 100%;
        height: 120px;
        margin-top: 20px;
    }
    .chat_right_item_1{
        width: 50px;
        height: 50px;
        background-color: #4459AB;
        float: right;
        margin-top: 10px;
        margin-left: 10px;
        margin-right: 10px;
        text-align: center;
        line-height: 50px;
        color: white;
        border-radius: 25px;
    }
    .chat_right_item_2{
        width: 55%;
        height: 100px;
        float: right;
        margin-top: 10px;
    }
    .chat_right_time{
        width: 100%;
        text-align: right;
    }
    .chat_right_content{
        float: right;
        padding: 15px;
        border-radius: 10px;
        margin-top: 10px;
        border-top-right-radius: 0px;
        background-color: #4F7cff;
        color: white;
    }
    /* foot */
    .chat_foot{
        width: 450px;
        height: 130px;
        border-bottom-left-radius: 10px;
        border-bottom-right-radius: 10px;
        position: relative;
    }
    .chat_context{
        width: 100%;
        height: 100%;
        font-size: 17px;
        box-sizing: border-box;
        outline: none;
        border-bottom-left-radius: 10px;
        border-bottom-right-radius: 10px;
        border-width: 0px;
        padding: 16px;
    }
    .chat_commit{
        width: 80px;
        height: 30px;
        color: white;
        background-color: #4F7cff;
        line-height: 30px;
        text-align: center;
        border-radius: 5px;
        position: absolute;
        right: 10px;
        bottom: 20px;
        margin-right: 10px;
    }
    .chat_context{
        resize: none;
    }
    .chat_context::placeholder{
        color: black;
        font-weight: 500k;
    }
    .line{
        width: 100%;
        border-top: 1px;
        border-color: #f4f5f7;
        border-style: solid;
    }
</style>
<body>
<!-- entry -->
<div class="chat_commento">
    <!-- top -->
    <div class="chat_top">
        是兄弟就来砍我
    </div>
    <!-- line -->
    <div class="line"></div>
    <!-- middle -->
    <div class="chat_middle" id="chat_middle_item">
        <!-- 左边 -->
        <div class="chat_left clearfix">
            <div class="chat_left_item_1 ">天乐</div>
            <div class="chat_left_item_2">
                <div class="chat_time">18:57</div>
                <div class="chat_left_content">
                    今天吃点啥？
                </div>
            </div>
        </div>
        <!--右边 -->
        <div class="chat_right">
            <div class="chat_right_item_1 ">热巴</div>
            <div class="chat_right_item_2 ">
                <div class="chat_right_time">18:59</div>
                <div class="chat_right_content">
                    最近八合里周年庆店，咱们去薅羊毛呀
                </div>
            </div>
        </div>
        <!-- l_2 -->
        <div class="chat_left clearfix">
            <div class="chat_left_item_1 ">天乐</div>
            <div class="chat_left_item_2">
                <div class="chat_time">18:57</div>
                <div class="chat_left_content">
                    行收拾一下走吧，早点去排个号
                </div>
            </div>
        </div>
    </div>
    <!-- line -->
    <div class="line"></div>
    <!-- foot -->
    <div class="chat_foot">
        <!-- context -->
        <textarea class="chat_context" id="chat_context_item" cols="30" rows="10" placeholder="请输入"></textarea>
        <div class="chat_commit" id="button">发送</div>
    </div>
</div>
<script>
    // 成功发送
    var send_message=document.getElementById("chat_middle_item");
    var domBtm=document.getElementById("button");
    // 发送内容
    var message=document.getElementById("chat_context_item");
    domBtm.addEventListener("click",function(){
        var str=message.value;
        var date=new Date();
        var hour=date.getHours();
        var mm=date.getMinutes();
        var time=hour+':'+mm;
        var ans='<div class="chat_right_item_1 clearfix">热巴</div>'+
            '<div class="chat_right_item_2">'+
            '<div class="chat_right_time clearfix">'+time+'</div>'+
            '<div class="chat_right_content clearfix">'+str+'</div>'
            +'</div>';
        var oLi=document.createElement("div");
        oLi.setAttribute("class","chat_right");
        oLi.innerHTML=ans;
        send_message.append(oLi);
        message.value="";
    });
</script>
</body>
</html>
